On August 16, the Lincoln Park Zoo welcomed a rare white-cheeked gibbon baby. Zoo keepers have not determined the gender of the newborn yet or given the little tyke a name.

“Burma is holding the baby close and showing every sign of being a great mom,” said Curator of Primates Maureen Leahy. “The youngster is bright, alert, and clinging well.”

Unlike other primates who raise offspring communally in groups, white-cheeked gibbon mothers are the primary caretakers of their babies. When the baby gets older, he or she will darken from tan to black in the first two years. If the gibbon is a male, he will remain black. If the gibbon is female, her fur will eventually turn back to tan.

In the wild, white-cheeked gibbons inhabit southeast Asia. They are endangered due to habitat loss and poaching.